Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * PSCI CPU idle driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2019 ARM Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define pr_fmt(fmt) "CPUidle PSCI: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/cpuhotplug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/cpu_cooling.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/cpuidle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/cpu_pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/psci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/pm_domain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/cpuidle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <trace/hooks/cpuidle_psci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "cpuidle-psci.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include "dt_idle_states.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) struct psci_cpuidle_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	u32 *psci_states;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static DEFINE_PER_CPU_READ_MOSTLY(struct psci_cpuidle_data, psci_cpuidle_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static DEFINE_PER_CPU(u32, domain_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static bool psci_cpuidle_use_cpuhp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) void psci_set_domain_state(u32 state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	__this_cpu_write(domain_state, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static inline u32 psci_get_domain_state(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	return __this_cpu_read(domain_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static inline int psci_enter_state(int idx, u32 state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter, idx, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static int __psci_enter_domain_idle_state(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 					  struct cpuidle_driver *drv, int idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 					  bool s2idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	struct psci_cpuidle_data *data = this_cpu_ptr(&psci_cpuidle_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	u32 *states = data->psci_states;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct device *pd_dev = data->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	u32 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ret = cpu_pm_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	trace_android_vh_cpuidle_psci_enter(dev, s2idle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	/* Do runtime PM to manage a hierarchical CPU toplogy. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	rcu_irq_enter_irqson();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (s2idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		dev_pm_genpd_suspend(pd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		pm_runtime_put_sync_suspend(pd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	rcu_irq_exit_irqson();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	state = psci_get_domain_state();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (!state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		state = states[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	ret = psci_cpu_suspend_enter(state) ? -1 : idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	rcu_irq_enter_irqson();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (s2idle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		dev_pm_genpd_resume(pd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		pm_runtime_get_sync(pd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	rcu_irq_exit_irqson();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	trace_android_vh_cpuidle_psci_exit(dev, s2idle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	cpu_pm_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	/* Clear the domain state to start fresh when back from idle. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	psci_set_domain_state(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int psci_enter_domain_idle_state(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 					struct cpuidle_driver *drv, int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	return __psci_enter_domain_idle_state(dev, drv, idx, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int psci_enter_s2idle_domain_idle_state(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 					       struct cpuidle_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 					       int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return __psci_enter_domain_idle_state(dev, drv, idx, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static int psci_idle_cpuhp_up(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	struct device *pd_dev = __this_cpu_read(psci_cpuidle_data.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (pd_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		pm_runtime_get_sync(pd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int psci_idle_cpuhp_down(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct device *pd_dev = __this_cpu_read(psci_cpuidle_data.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (pd_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		pm_runtime_put_sync(pd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		/* Clear domain state to start fresh at next online. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		psci_set_domain_state(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static void psci_idle_init_cpuhp(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (!psci_cpuidle_use_cpuhp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	err = cpuhp_setup_state_nocalls(CPUHP_AP_CPU_PM_STARTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 					"cpuidle/psci:online",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 					psci_idle_cpuhp_up,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 					psci_idle_cpuhp_down);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		pr_warn("Failed %d while setup cpuhp state\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static int psci_enter_idle_state(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 				struct cpuidle_driver *drv, int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	u32 *state = __this_cpu_read(psci_cpuidle_data.psci_states);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	return psci_enter_state(idx, state[idx]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static const struct of_device_id psci_idle_state_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	{ .compatible = "arm,idle-state",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	  .data = psci_enter_idle_state },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int psci_dt_parse_state_node(struct device_node *np, u32 *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	int err = of_property_read_u32(np, "arm,psci-suspend-param", state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		pr_warn("%pOF missing arm,psci-suspend-param property\n", np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (!psci_power_state_is_valid(*state)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		pr_warn("Invalid PSCI power state %#x\n", *state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static int psci_dt_cpu_init_topology(struct cpuidle_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 				     struct psci_cpuidle_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 				     unsigned int state_count, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/* Currently limit the hierarchical topology to be used in OSI mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!psci_has_osi_support())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	data->dev = psci_dt_attach_cpu(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (IS_ERR_OR_NULL(data->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		return PTR_ERR_OR_ZERO(data->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 * Using the deepest state for the CPU to trigger a potential selection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * of a shared state for the domain, assumes the domain states are all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 * deeper states.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	drv->states[state_count - 1].enter = psci_enter_domain_idle_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	drv->states[state_count - 1].enter_s2idle = psci_enter_s2idle_domain_idle_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	psci_cpuidle_use_cpuhp = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static int psci_dt_cpu_init_idle(struct device *dev, struct cpuidle_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 				 struct device_node *cpu_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 				 unsigned int state_count, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	u32 *psci_states;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	struct device_node *state_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	state_count++; /* Add WFI state too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	psci_states = devm_kcalloc(dev, state_count, sizeof(*psci_states),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 				   GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (!psci_states)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	for (i = 1; i < state_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		state_node = of_get_cpu_state_node(cpu_node, i - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		if (!state_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		ret = psci_dt_parse_state_node(state_node, &psci_states[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		of_node_put(state_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (i != state_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	/* Initialize optional data, used for the hierarchical topology. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	ret = psci_dt_cpu_init_topology(drv, data, state_count, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	/* Idle states parsed correctly, store them in the per-cpu struct. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	data->psci_states = psci_states;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static int psci_cpu_init_idle(struct device *dev, struct cpuidle_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			      unsigned int cpu, unsigned int state_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct device_node *cpu_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	 * If the PSCI cpu_suspend function hook has not been initialized
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	 * idle states must not be enabled, so bail out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (!psci_ops.cpu_suspend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	cpu_node = of_cpu_device_node_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (!cpu_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	ret = psci_dt_cpu_init_idle(dev, drv, cpu_node, state_count, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	of_node_put(cpu_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static void psci_cpu_deinit_idle(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	psci_dt_detach_cpu(data->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	psci_cpuidle_use_cpuhp = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int psci_idle_init_cpu(struct device *dev, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	struct cpuidle_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	struct device_node *cpu_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	const char *enable_method;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	cpu_node = of_cpu_device_node_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (!cpu_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	 * Check whether the enable-method for the cpu is PSCI, fail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	 * if it is not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	enable_method = of_get_property(cpu_node, "enable-method", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (!enable_method || (strcmp(enable_method, "psci")))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	of_node_put(cpu_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	if (!drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	drv->name = "psci_idle";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	drv->owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	drv->cpumask = (struct cpumask *)cpumask_of(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	 * PSCI idle states relies on architectural WFI to be represented as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	 * state index 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	drv->states[0].enter = psci_enter_idle_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	drv->states[0].exit_latency = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	drv->states[0].target_residency = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	drv->states[0].power_usage = UINT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	strcpy(drv->states[0].name, "WFI");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	strcpy(drv->states[0].desc, "ARM WFI");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	 * If no DT idle states are detected (ret == 0) let the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	 * initialization fail accordingly since there is no reason to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	 * initialize the idle driver if only wfi is supported, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	 * default archictectural back-end already executes wfi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	 * on idle entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	ret = dt_init_idle_driver(drv, psci_idle_state_match, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (ret <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		return ret ? : -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	 * Initialize PSCI idle states.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	ret = psci_cpu_init_idle(dev, drv, cpu, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		pr_err("CPU %d failed to PSCI idle\n", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	ret = cpuidle_register(drv, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		goto deinit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	cpuidle_cooling_register(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) deinit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	psci_cpu_deinit_idle(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)  * psci_idle_probe - Initializes PSCI cpuidle driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)  * Initializes PSCI cpuidle driver for all CPUs, if any CPU fails
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)  * to register cpuidle driver then rollback to cancel all CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  * registration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static int psci_cpuidle_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	int cpu, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	struct cpuidle_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	struct cpuidle_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		ret = psci_idle_init_cpu(&pdev->dev, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	psci_idle_init_cpuhp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) out_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	while (--cpu >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		dev = per_cpu(cpuidle_devices, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		drv = cpuidle_get_cpu_driver(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		cpuidle_unregister(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		psci_cpu_deinit_idle(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static struct platform_driver psci_cpuidle_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	.probe = psci_cpuidle_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		.name = "psci-cpuidle",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static int __init psci_idle_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	ret = platform_driver_register(&psci_cpuidle_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	pdev = platform_device_register_simple("psci-cpuidle", -1, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (IS_ERR(pdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		platform_driver_unregister(&psci_cpuidle_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		return PTR_ERR(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) device_initcall(psci_idle_init);